Senior Full Stack Engineer, Client Platform
Penn Interactive2 months ago
Remote, United StatesSenior
Base Salary
$135k - $180k/yr
Responsibilities
- Design and evolve federated GraphQL schemas and server-driven UI contracts shared by iOS, Android, and web clients.
- Classify breaking schema changes, coordinate migrations, and keep generated client models synchronized.
- Develop, scale, and optimize GraphQL APIs, RPC endpoints, SQL queries, and backend services.
- Build fast, accessible web applications and shared libraries with React and TypeScript.
- Partner with product and design teams to architect and ship customer-facing features.
- Configure monitoring and alerting in DataDog and use observability tools to diagnose production issues.
- Identify technical debt, performance bottlenecks, production risks, and scalability improvements.
- Mentor teammates through code review, pairing, documentation, and technical design work.
- Write thorough tests and collaborate with QA on automated testing pipelines and CI/CD workflows.
- Own production releases, participate in on-call support, and use Claude Code in daily development.
Requirements
- At least 5 years of software engineering experience.
- At least 2 years designing and evolving GraphQL schemas for product surfaces used by iOS, Android, and web clients.
- Strong JavaScript, TypeScript, React, HTML, CSS, browser APIs, and UX skills.
- Strong foundations in data structures, distributed systems, algorithms, and software design.
- Experience with production systems at scale, load testing, tracing, and diagnosing CPU and latency regressions.
- Experience with API development using Node, Bun, or another server framework such as Phoenix, Ruby on Rails, FastAPI, or Laravel.
- Experience building multi-client or white-label platforms with geo-based routing and per-brand configuration.
- Experience with Kubernetes and operating services in containers.
- Experience with Git, GitHub or similar tools, terminal workflows, and a development editor.
- Experience with Jest or Vitest and ExUnit, RSpec, or pytest.
- Clear technical writing, including specifications, runbooks, and cross-team design documents.
- Preferred qualifications include Apollo Federation, Absinthe, Swift or Kotlin mobile development, hexagonal architecture, domain-driven design, PostgreSQL, MySQL, Oban, Exq, Sidekiq, Celery, Kafka, RabbitMQ, SQS/SNS, Pub/Sub, open-source contributions, startup experience, and sports or esports interest.
Benefits
- Competitive compensation package.
- Fun, relaxed work environment.
- Education and conference reimbursements.
- Opportunities for career progression and mentoring others.
- Remote work arrangement, indicated by #LI-REMOTE.
Tech Stack
Apache KafkaDatadogFastAPIGitGraphQLiOSJavaScriptJestKotlinKubernetesLaravelMySQLNode.jsPhoenixPostgreSQLpytestRabbitMQReactRSpecRuby on RailsSQLSwiftTypeScript
Categories
About Penn Interactive
Penn Interactive is the digital product and engineering arm of PENN Entertainment (NASDAQ: PENN), developing and operating online sportsbook and iCasino platforms for regulated markets in North America. Its portfolio includes ESPN BET in the U.S., theScore Bet in Ontario, and Hollywood Casino online, all built on proprietary tech. Backed by a parent company headquartered in Wyomissing, Pennsylvania that operates 40+ casinos across 20 states, it connects online play with on-property experiences.